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Equity Method Investments - Additional Information (Detail)
$ in Millions, SEK in Billions
3 Months Ended 9 Months Ended
Apr. 18, 2017
SEK
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Apr. 18, 2017
USD ($)
Schedule Of Equity Method Investments [Line Items]            
(Loss) income from equity method investments   $ (9.4) $ 0.5 $ (16.5) $ 1.2  
Zenuity            
Schedule Of Equity Method Investments [Line Items]            
Cash contribution to joint venture | SEK SEK 1          
Ownership percentage in joint venture           50.00%
Enterprise value of joint venture           $ 250.0
Share in enterprise value of joint venture           $ 125.0
(Loss) income from equity method investments   (10.0)   (18.0)    
Equity investments   $ 112.0   $ 112.0    
Zenuity | Volvo Cars            
Schedule Of Equity Method Investments [Line Items]            
Ownership percentage in joint venture           50.00%